Tuesday, June 12, 2007

GSI Date For Male And Female Telescope Shiners

We've been processing our June catch of telescope shiners from Hurricane Creek. Many individuals have the largest gonads we've found yet, especially the males. I suspect that June may turn out to be the peak breeding month for telescopes in Hurricane Creek. Average female GSI (gonado-somatic index) is 14.9, average male GSI is 6.2, both very high values. Several females were about 30, which is to say that a third of their body mass is ovaries and eggs.

Below are the graphs for male and female GSI, from February to June. Both sexes show a clear trend from very low to very high GSI across these five months. Error bars indicate standard error.
Today we did a fair amount of dissecting preserved ovaries and photographing the eggs for future counts. I think we did 9 females from the June collection. So we should start generating that data in the next week or two. See you 'round....

0 Comments:

Post a Comment

<< Home